CAT24FC17
16-kb I
2
C Serial EEPROM
FEATURES
I
400 kHz (2.5 V) I
2
C bus compatible
I
2.5 to 5.5 volt operation
I
Low power CMOS technology
I
16-byte page write buffer
I
Industrial and extended temperature ranges
I
Self-timed write cycle with auto-clear
I
1,000,000 program/erase cycles
I
100 year data retention
I
8-pin DIP, 8-pin SOIC, 8-pin TSSOP, 8-pin MSOP
and TDFN packages
- “Green” package option available
I
256 x 8 Memory organization
I
Hardware write protect
- Top 1/2 array protected when WP at V
IH
DESCRIPTION
The CAT24FC17 is a 16-kb Serial CMOS EEPROM
internally organized as 2048 words of 8 bits each.
Catalyst’s advanced CMOS technology substantially
reduces device power requirements. The CAT24FC17
PIN CONFIGURATION
DIP Package (P, L, GL)
NC
NC
NC
VSS
1
2
3
4
8
7
6
5
VCC
WP
SCL
SDA
SOIC Package (J, W, GW)
NC
NC
NC
VSS
TSSOP Package (U, Y, GY)
MSOP Package (R, Z, GZ)
NC
NC
NC
VSS
1
2
3
4
8
7
6
5
i
D
VSS
3
4
NC
NC
NC
1
2
c
s
VCC
WP
SCL
SDA
n
o
8
7
6
5
VCC
WP
SCL
SDA
VCC 1
WP 2
SCL 3
SDA 4
1
2
3
4
8
7
6
5
i
t
VCC
WP
SCL
SDA
u
n
VCC
VSS
SDA
WP
SCL
features a 16-byte page write buffer. The device operates
via the I
2
C bus serial interface has a special write
protection feature and is available in 8-pin DIP, SOIC,
TSSOP, MSOP and TDFN packages.
BLOCK DIAGRAM
EXTERNAL LOAD
d
e
a
P
XDEC
t
r
DOUT
ACK
SENSE AMPS
SHIFT REGISTERS
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
START/STOP
LOGIC
E
2
PROM
CONTROL
LOGIC
DATA IN STORAGE
TDFN Package
(RD4, ZD4, GD4)
8 NC
7 NC
6 NC
5 VSS
HIGH VOLTAGE/
TIMING CONTROL
STATE COUNTERS
PIN FUNCTIONS
Pin Name
NC
SDA
SCL
WP
V
CC
Function
No Connect
Serial Data/Address
Serial Clock
Write Protect
2.5 V to 5.5 V Power Supply
Ground
Doc. No. 1077, Rev. F
* Catalyst Semiconductor is licensed by Philips Corporation
to carry the I
2
C Bus Protocol.
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
V
SS
1
CAT24FC17
ABSOLUTE MAXIMUM RATINGS*
Temperature Under Bias
–55°C to +125°C
Storage Temperature ....................... –65°C to +150°C
Voltage on Any Pin with
Respect to Ground
(1)
............ –2.0 V to V
CC
+ 2.0 V
V
CC
with Respect to Ground ............. –2.0 V to +7.0 V
Package Power Dissipation
Capability (T
A
= 25°C) .................................. 1.0 W
RELIABILITY CHARACTERISTICS
(3)
Symbol
N
END
T
DR
V
ZAP
I
LTH(4)
Parameter
Endurance
Data Retention
ESD Susceptibility
Latch-up
Lead Soldering Temperature (10 seconds) ...... 300°C
Output Short Circuit Current
(2)
....................... 100 mA
*COMMENT
Stresses above those listed under “Absolute Maximum Ratings” may
cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions
outside of those listed in the operational sections of this specification is not
implied. Exposure to any absolute maximum rating for extended periods
may affect device performance and reliability.
Min
1,000,000
100
4000
Typ
D.C. OPERATING CHARACTERISTICS
V
CC
= 2.5 V to 5.5 V, unless otherwise specified.
Symbol
I
CC
I
CC
I
SB(5)
I
LI
I
LO
V
IL
V
IH
V
OL
Parameter
Power Supply Current (Read)
Power Supply Current (Write)
Standby Current (V
CC
= 5.0 V)
Input Leakage Current
Output Leakage Current
Input Low Voltage
Test Conditions
V
IN
= GND or V
CC
V
IN
= GND to V
CC
Input High Voltage
Output Low Voltage (V
CC
= 3.0 V)
CAPACITANCE
T
A
= 25°C, f = 400 kHz, V
CC
= 5 V
Symbol
C
I/O(3)
C
IN(3)
Test
Conditions
V
I/O
= 0 V
V
IN
= 0 V
Min
Typ
Max
8
6
Units
pF
pF
Input/Output Capacitance (SDA)
Input Capacitance (other pins)
Note:
(1) The minimum DC input voltage is –0.5 V. During transitions, inputs may undershoot to –2.0 V for periods of less than 20 ns. Maximum DC
voltage on output pins is V
CC
+ 0.5 V, which may overshoot to V
CC
+ 2.0 V for periods of less than 20 ns.
(2) Output shorted for no more than one second. No more than one output shorted at a time.
(3) These parameters are tested initially and after a design or process change that affects the parameter according tp appropriate AEC-Q100
and JEDEC test methods.
(4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1.0 V to V
CC
+ 1.0 V.
(5) Maximum standby current (I
SB
) = 10µA for the Extended Automotive temperature range.
i
D
c
s
n
o
V
OUT
= GND to V
CC
i
t
f
SCL
= 400 kHz
f
SCL
= 400 kHz
u
n
d
e
Min
–1
100
a
P
Max
Max
1
3
1
1
1
V
CC
x 0.3
V
CC
+ 1.0
0.4
Units
Cycles/Byte
Years
Volts
mA
t
r
Units
mA
mA
µA
µA
µA
V
V
V
Typ
V
CC
x 0.7
I
OL
= 3 mA
Doc. No. 1077, Rev. F
2
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT24FC17
A.C. CHARACTERISTICS
V
CC
= 2.5 V to 5.5 V, unless otherwise specified.
Read & Write Cycle Limits
Symbol
Parameter
2.5 V - 5.5 V
Min
F
SCL
T
I(1)
t
AA
t
BUF(1)
t
HD:STA
t
LOW
t
HIGH
t
SU:STA
t
HD:DAT
t
SU:DAT
t
R(1)
t
F(1)
t
SU:STO
t
DH
Clock Frequenc
Noise Suppression Time Constant at SCL, SDA Inputs
SCL Low to SDA Data Out and ACK Out
Time the Bus Must be Free Before a New Transmission
Can Start
Start Condition Hold Time
Clock Low Period
Clock High Period
Start Condition Setup Time
(for a Repeated Start Condition)
Data In Hold Time
Data In Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Condition Setup Time
Data Out Hold Time
1300
600
1300
Max
400
100
Units
Power-Up Timing
(1)(2)
Symbol
t
PUR
t
PUW
Power-up to Read Operation
Power-up to Write Operation
Write Cycle Limits
Symbol
t
WR
The write cycle time is the time from a valid stop
condition of a write sequence to the end of the internal
program/erase cycle. During the write cycle, the bus
i
D
c
s
Parameter
n
o
i
t
u
n
d
e
600
600
0
100
600
100
Typ
Typ
a
P
300
300
Max
1
1
900
t
r
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kHz
Min
Units
ms
ms
Parameter
Min
Max
5
Units
ms
Write Cycle Time
interface circuits are disabled, SDA is allowed to remain
high, and the device does not respond to its slave
address.
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) t
PUR
and t
PUW
are the delays required from the time V
CC
is stable until the specified operation can be initiated.
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc No. 1077, Rev. F
CAT24FC17
FUNCTIONAL DESCRIPTION
The CAT24FC17 supports the I
2
C Bus data transmission
protocol. This Inter-Integrated Circuit Bus protocol defines
any device that sends data to the bus to be a transmitter
and any device receiving data to be a receiver. Data
transfer is controlled by the Master device which
generates the serial clock and all START and STOP
conditions for bus access. The CAT24FC17 operates as
a Slave device. Both the Master and Slave devices can
operate as either transmitter or receiver, but the Master
device controls which mode is activated.
PIN DESCRIPTIONS
SCL:
Serial Clock
The CAT24FC17 serial clock input pin is used to clock all
data transfers into or out of the device. This is an input
pin.
SDA:
Serial Data/Address
The CAT24FC17 bidirectional serial data/address pin is
used to transfer data into and out of the device. The SDA
pin is an open drain output and can be wire-ORed with
other open drain or open collector outputs.
WP:
Write Protect
This input, when tied to GND, allows write operations to
the entire memory. When this pin is tied to V
CC
, the
upper half of the memory array is write protected. When
left floating or tied to V
SS,
normal read/write operations
are allowed.
Figure 1. Bus Timing
tF
tLOW
SCL
tSU:STA
tHD:STA
tHD:DAT
tHIGH
tLOW
tR
SDA IN
SDA OUT
Figure 2. Write Cycle Timing
SCL
SDA
Figure 3. Start/Stop Timing
i
D
c
s
8TH BIT
BYTE n
n
o
ACK
tAA
i
t
u
n
tSU:DAT
tDH
d
e
a
P
t
r
tSU:STO
tBUF
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
SDA
SCL
START BIT
STOP BIT
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 1077, Rev. F
4
CAT24FC17
I
2
C BUS PROTOCOL
The following defines the features of the I
2
C bus proto-
col:
(1) Data transfer may be initiated only when the bus is
not busy.
(2) During a data transfer, the data line must remain
stable whenever the clock line is high. Any changes
in the data line while the clock line is high will be
interpreted as a START or STOP condition.
START Condition
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of
SDA when SCL is HIGH. The CAT24FC17 monitor the
SDA and SCL lines and will not respond until this
condition is met.
STOP Condition
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition.
whether a Read or Write operation is to be performed.
When this bit is set to 1, a Read operation is selected,
and when set to 0, a Write operation is selected.
After the Master sends a START condition and the slave
address byte, the CAT24FC17 monitors the bus and
responds with an acknowledge (on the SDA line) when
its address matches the transmitted slave address. The
CAT24FC17 then performs a Read or a Write operation
depending on the state of the R/W bit.
Acknowledge
After a successful data transfer, each receiving device is
required to generate an acknowledge. The Acknowledg-
ing device pulls down the SDA line during the ninth clock
cycle, signaling that it received the 8 bits of data.
The CAT24FC17 responds with an acknowledge after
receiving a START condition and its slave address. If the
device has been selected along with a write operation,
it responds with an acknowledge after receiving each
byte.
DEVICE ADDRESSING
The Master begins a transmission by sending a START
condition. The Master then sends the address of the
particular slave device it is requesting. The four most
significant bits of the 8-bit slave address are fixed as
1010 for the CAT24FC17 (see Fig. 5). The next three
significant bits (A10, A9, A8) are the memory array
address bits. The last bit of the slave address specifies
Figure 4. Acknowledge Timing
i
D
DATA OUTPUT
FROM TRANSMITTER
c
s
1
SCL FROM
MASTER
n
o
START
0
1
0
i
t
1
u
n
When the CAT24FC17 begins a READ mode, it trans-
mits 8 bits of data, releases the SDA line, and monitors
the line for an acknowledge. Once it receives this ac-
knowledge, the CAT24FC17 will continue to transmit
data. If no acknowledge is sent by the Master, the device
terminates data transmission and waits for a STOP
condition.
d
e
8
a
P
9
t
r
DATA OUTPUT
FROM RECEIVER
ACKNOWLEDGE
Figure 5. Slave Address Bits
A10
A9
A8
R/W
Normal Read and Write
DEVICE ADDRESS
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc No. 1077, Rev. F
编程基础
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
